The Raymarine M78717 is a bronze retractable depth transducer operating at 200 kHz, designed for reliable bottom-tracking performance on vessels where a fixed through-hull installation isn't practical. The retractable design allows the transducer to be pulled inside the hull when not in use, reducing drag and protecting the unit in shallow water or at the dock.

Specifications:

• Type: Retractable depth transducer
• Housing material: Bronze
• Frequency: 200 kHz